 package xin.petstore.framework.web.validator;
 
 import xin.petstore.framework.cas.SessionUtils;
 import java.awt.Color;
 import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Random;
 import javax.imageio.ImageIO;

 public class ImageCodeEngine
 {
   public static final String IMAGE_VALID_CODE = "image_valid_code";
 
   private Color getRandColor(int fc, int bc)
   {
     Random random = new Random();
     if (fc > 255)
       fc = 255;
     if (bc > 255)
       bc = 255;
     int r = fc + random.nextInt(bc - fc);
     int g = fc + random.nextInt(bc - fc);
     int b = fc + random.nextInt(bc - fc);
     return new Color(r, g, b);
   }
 
   public String genCode(OutputStream output) {
     String sRand = "";
 
     int width = 60; int height = 20;
     BufferedImage image = new BufferedImage(width, height, 
       1);
 
     Graphics g = image.getGraphics();
 
     g.setColor(getRandColor(200, 250));
     g.fillRect(0, 0, width, height);
 
     g.setFont(new Font("Times New Roman", 0, 18));
 
     Random random = new Random();
 
     g.setColor(getRandColor(160, 200));
     for (int i = 0; i < 155; i++) {
       int x = random.nextInt(width);
       int y = random.nextInt(height);
       int xl = random.nextInt(12);
       int yl = random.nextInt(12);
       g.drawLine(x, y, x + xl, y + yl);
     }
 
     for (int i = 0; i < 4; i++) {
       String rand = String.valueOf(random.nextInt(10));
       sRand = sRand + rand;
 
       g.setColor(
         new Color(20 + random.nextInt(110), 20 + random
         .nextInt(110), 20 + random.nextInt(110)));
       g.drawString(rand, 13 * i + 6, 16);
     }
 
     g.dispose();
     try
     {
       ImageIO.write(image, "JPEG", output);
     }
     catch (IOException e) {
       e.printStackTrace();
     }
     return sRand;
   }
 
   public static boolean valid(String rand) {
     String srand = (String)SessionUtils.getSession().getAttribute("image_valid_code");
     return rand.equalsIgnoreCase(srand);
   }
 }
